I can see gratuities going up along with the cost of liquor based drinks (not so much beer and wine because you can still bring some on), but anything that you're a captive audience for, I can see the cost rising.
I can also see more add ons - they already have for-fee popcorn, I can see them adding a full concession area with a variety of candy and treats and of course, canned soda (because hey, if you're already whipping out the card, why run up to the pool deck to save a couple of bucks).
I also think the Dream won't end up being the only ship with the extra cost candy shop and the for-fee ice cream. And I can see the hours of the ice cream and flavour varieties of "free" soft serve being limited (maybe only vanilla, chocolate and twist and hours being shortened to noon - 6pm).
They've already started with the extra fee, upgraded food on the Palo and Remy menus, I can see they'll add it to the regular MDR menus - an upcharge for the Palo Chocolate Soufflé or the filet that's so popular. They'll market it as being for those who don't want to dine without their kids but still be able to enjoy a "taste of Palo".
If Disney decided to upgrade their soda machines to the Coke Freestyle, I can also see that there will be an upcharge. As long as they have the so-so soda fountains, I don't see Disney going back to charging for it. They would need to ensure that the soda mix was always perfect.
If DCL starts to be a pay to play cruise and also still tries to charge more we are for sure done. Last year we were able to almost make it on our obc, because we don't do a lot of excursions because we hav been to most of the ports already. This year we got a great deal, so we will see what happens this year.
The danger DCL has trying to match the industry standard is that they are overpriced, and they don't care about repeat cruisers! Anyone that wants to disagree on the second point is drinking the DCL kool-aid, other lines do a lot more for repeat cruisers.